Gotta love a game where you can only actually press the all-important 'DROP' button 50% of the time in very specific locations, and even then it has a chance to bug and not actually drop a ball.
Thanks for giving the early build a try. The current version definitely has bug on our radar with the drop button often misbehaving (we think if clicked right when the cooldown runs out). We'll be fixing it soon along with a number of other bugs that helpful playtesters have flagged.